package com.lovelyj.trip_by_train.filter;

import com.alibaba.fastjson.JSON;
import com.lovelyj.trip_by_train.common.R;
import com.lovelyj.trip_by_train.common.BaseContext;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;


@Slf4j
@WebFilter(filterName = "loginCheckFilter" ,urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    /**
     * url匹配器
     */
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        String requestURI = request.getRequestURI();

        String[] urls=new String[]{
                "/administrator/login",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/**",
                "/element-ui/**",
                "/js/**"
        };

        boolean check =check(urls,requestURI);

        if(check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request, response);
            return;
        }

        if(request.getSession().getAttribute("administrator") != null){
            log.info("用户已登录，用户id为{}",request.getSession().getAttribute("administrator"));

            Long empId = (Long) request.getSession().getAttribute("administrator");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request, response);
            return;
        }

        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id为{}",request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request, response);
            return;
        }

        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));

        log.info("拦截到请求：{}",request.getRequestURI());
        return;
    }

    public boolean check(String[] urls,String requestURI){
        for(String url:urls){
            if(PATH_MATCHER.match(url,requestURI)){
                return true;
            }
        }
        return false;

    }


}
